Disorder and Correlations in Novel Two-Dimensional Systems

新型二维系统中的无序和相关性

• 批准号: 9501160
• 负责人: Philip Adams
• 金额: $ 19.1万
• 依托单位: Louisiana State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-06-01 至 1999-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9501160&HistoricalAwards=false
• 关键词: Disorder; Correlations; Novel; Two; Dimensional

9501160 Adams Experiments are proposed to study the transport properties of two very different disordered two-dimensional systems. The first area of study is the superconductor-insulator (S-I) transition in granular aluminum films by the application of a parallel magnetic field to drive the transition. This technique, which avoids complications associated with flux flow resistance, has proven to be very useful in determining the relative roles of disorder, Josephson coupling, and Coulomb blockade in the generic characteristics of granular film S-I transitions. These studies are ultimately aimed at developing a superconducting field- effect transistor in a granular system. In addition, studies of the effects of disorder and electron-electron interactions in the transport properties of electrons sprayed onto solid hydrogen are being made. This is a model system from which one can obtain valuable insights into the transport properties of more conventional disordered semiconducting systems. %%% Experiments are proposed to study the electrical properties of two very different disordered two-dimensional types of material. The first area of study concerns the mechanisms involved in the destruction of superconductivity in very thin aluminum films. This work will attempt to determine the relative roles of disorder, superconductivity, and single electron charging effects in the generic electrical characteristics of granular aluminum films at low temperatures. The ultimate goal of these studies is the development of a superconducting field-effect transistor using granular materials. In addition, studies of the effects of disorder and electron-electron interactions in the electric transport properties of electrons sprayed onto solid hydrogen are being made. This material serves as a model from which one can obtain valuable insights into the transport properties of more conventional semic onducting materials, such as those used in the microelectronics industry. ***

9501160个ADAMS实验被用来研究两个截然不同的无序二维系统的输运性质。第一个研究领域是利用平行磁场驱动颗粒铝薄膜中的超导体-绝缘体(S-I)相变。这项技术避免了与磁通流动阻力相关的复杂问题，已被证明在确定无序、约瑟夫森耦合和库仑阻塞在颗粒膜S-I相变的一般特征中的相对作用方面非常有用。这些研究的最终目标是在颗粒系统中开发一种超导场效应晶体管。此外，正在研究无序和电子-电子相互作用对喷射到固体氢上的电子的输运性质的影响。这是一个模型系统，人们可以从中获得对更传统的无序半导体系统的输运性质的有价值的见解。%实验被用来研究两种截然不同的无序二维材料的电学性质。第一个研究领域涉及破坏超薄铝膜超导电性的机制。这项工作将试图确定无序、超导和单电子荷电效应在颗粒铝薄膜低温通用电学特性中的相对作用。这些研究的最终目标是开发一种使用颗粒材料的超导场效应晶体管。此外，正在研究无序和电子-电子相互作用对喷射到固体氢上的电子的电输运性质的影响。这种材料可以作为一种模型，从中可以获得对更传统的半导体材料的传输特性的有价值的见解，例如用于微电子工业的那些材料。***